Earring nut



FIG. 1 is a top plan view of an earring nut showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an elevational view rotated 45° from its position in FIG. 2;

FIG. 4 is a bottom plan view thereof. 

The ornamental design for an earring nut, substantially as shown. 